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Overclocking Raspberry Pi

October 26, 2012

READ This Article on RasPi Resources

What do you call An icing on a Pie? A $25 Computer with 700MHz processor, which can be used at 1GHz without losing the warrant or losing an extra penny.

So, we heard it and we read it. That, with the new pre-configured over-clocking presets in the updated Raspbian version, you can achieve 50% more performance. So we thought to give it a try.

And what could have been better than Linpack to put it on test. So we compiled Linpack on our Raspberry Model B (256MB) and gave it a dry run with its default processor and bus frequencies. And this is what we achieved

Then we decided to test every preset and see what would happen. Here is the result of ever present. Setting the present was simple enough. We ran the raspberry pi configurator using the following command

$sudo raspi-config

And select the overclock menu option. Then we were presented with 5 present menu options as follows

So, we started running LINPACK with every present, and here is what we got.

Default Preset:-

Average Kflops

43496.67

Proc Freq (in MHz)

700.00

Core Bus Freq (in MHz)

250.00

SDRam Freq (in MHz)

400.00


Modest Preset:-

Average Kflops

48913.83

Proc Freq (in Mhz)

800.00

Core Bus Freq (in Mhz)

300.00

SDRam Freq (in Mhz)

400.00

Medium Preset:-

Average Kflops

55312.60

Proc Freq (in Mhz)

900.00

Core Bus Freq (in Mhz)

333.00

SDRam Freq (in Mhz)

450.00

High Preset :-

Average Kflops

62391.80

Proc Freq (in Mhz)

950.00

Core Bus Freq (in Mhz)

450.00

SDRam Freq (in Mhz)

450.00

Turbo Preset

Average Kflops

65047.60

Proc Freq (in Mhz)

1000.00

Core Bus Freq (in Mhz)

500.00

SDRam Freq (in Mhz)

500.00

And the final Verdict

In our simple and un-optimized test bed we were able to achieve a performance gain of 49.5% by just updating the software. This no doubt is the beauty of Open Architecture and Open Source married together. Below is a percentage graph which depicts the gradual change in the performance and its co relation with the over clocking presents and its variables.

Next, we will try to do the same set of tests on the New RaspberryPi Model B with 512MB of RAM J

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